Chess Front End Refactor & Testing Challenge

Setup

npm install

To run the test watcher, run

npm t

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Introduction

Chess has a function getUserRating that determines a user's rating, calculated from the user object, which has this form:

{
  yearsActive: 0,
  membershipLevel: 'free', // could be 'free', 'bronze', 'silver', and 'gold'
  games: {
    won: 0,
    lost: 0,
    draw: 0,
    forfeited: 0,
  },
}

A user's rating will start at 0 initially and will increase or decrease based off the following rules implemented in the getUserRating method:

User Longevity (yearsActive)

• A user gets 1 point per years active
• Every 5 years, a user gets 2 additional points
  • 5 years would accrue 7 points
  • 17 years would accrue 23 points

Membership Level (membershipLevel)

• 3 points for gold membership
• 2 points for silver membership
• 1 point for bronze membership
• 0 points for free membership

Games Played (games)

• 3 points per won game
• 1 point per draw
• -1 point per lost game
• -2 points per forfeited game UNLESS a user has a gold membership, in which they lose 0 points

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Based off the above criteria and the given user, this method call should return getUserRating a total rating of 6.

const userRating = getUserRating({
  yearsActive: 1, // 1 point
  membershipLevel: 'silver', // 2 points
  games: {
    won: 1, // 3 points
    forfeited: 1, // -2 points
    lost: 3, // -3 points
    draw: 5, // 5 points
  }
});

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Goals

During your interview, demonstrate your skills of TDD (Test Driven Development) and refactoring by completing the following items in what you feel is the most important order:

• Spot any code smells and find ways to refactor
• Based off the requirements, get method getUserRating under test coverage
• Fix any issues found during TDD
• Implement a new feature where 1 extra point is awarded for every 10 games a user has played

Keep in mind that the goal is not to finish this problem, but to give you a chance to demonstrate your approach and thinking.